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WO2005085326A1 - Poudre polymere a particules de suie, procede de production et corps moules realises a partir de cette poudre polymere - Google Patents

Poudre polymere a particules de suie, procede de production et corps moules realises a partir de cette poudre polymere Download PDF

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Publication number
WO2005085326A1
WO2005085326A1 PCT/EP2004/053420 EP2004053420W WO2005085326A1 WO 2005085326 A1 WO2005085326 A1 WO 2005085326A1 EP 2004053420 W EP2004053420 W EP 2004053420W WO 2005085326 A1 WO2005085326 A1 WO 2005085326A1
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Prior art keywords
powder
polymer
polyamide
polymeφulver
layer
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PCT/EP2004/053420
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German (de)
English (en)
Inventor
Sylvia Monsheimer
Franz-Erich Baumann
Maik Grebe
Wolfgang Christoph
Wolfgang Franz
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Degussa Ag
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Publication of WO2005085326A1 publication Critical patent/WO2005085326A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/10—Processes of additive manufacturing
    • B29C64/141—Processes of additive manufacturing using only solid materials
    • B29C64/153—Processes of additive manufacturing using only solid materials using layers of powder being selectively joined, e.g. by selective laser sintering or melting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y70/00—Materials specially adapted for additive manufacturing
    • B33Y70/10—Composites of different types of material, e.g. mixtures of ceramics and polymers or mixtures of metals and biomaterials
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/12—Powdering or granulating
    • C08J3/14—Powdering or granulating by precipitation from solutions

Definitions

  • the invention relates to a polymer powder based on thermoplastic, preferably polyamide, particularly preferably polyamide 12, which has carbon black particles, a process for producing this powder, and moldings, produced by a layer-by-layer process with which areas of a layer are selectively introduced by the introduction of electromagnetic energy be melted using this powder. After the process according to the invention has ended, the body is cooled.
  • the selectivity of the layer-by-layer processes can be carried out by applying susceptors, absorbers, inhibitors, masks, or by focused energy input, for example by means of a laser beam or a glass fiber cable.
  • One method that is particularly well suited for the purpose of rapid prototyping is selective laser sintering.
  • plastic ulvers in a chamber are selectively exposed briefly to a laser beam, as a result of which the powder particles that are hit by the laser beam melt. The melted particles run into each other and quickly solidify again to a solid mass. By repeatedly exposing newly applied layers, three-dimensional bodies can be produced easily and quickly with this process.
  • the method of laser sintering (rapid prototyping) for the production of moldings from powdery polymers is described in detail in the patents US 6,136,948 and WO 96/06881 (both DTM Corporation).
  • a variety of polymers and copolymers are claimed for this application, such as polyacetate, polypropylene, polyethylene, ionomers and polyamide.
  • PA 12 polyamide 12 powder
  • the parts made from PA 12 powder meet the high demands placed on mechanical stress and their properties are particularly close to the later series parts that are created by extrusion or injection molding.
  • a polyamide 12 powder with a melting temperature of 185-189 ° C., a melting enthalpy of 112 J / g and a solidification temperature of 138 to 143 ° C. is preferred, as described in EP 0911 142.
  • Powdery substrates in particular polymers or copolymers, preferably selected from polyester, polyvinylchloride, polyacetal, polypropylene, polyethylene, polystyrene, polycarbonate, polycarbonate, can be used for the aforementioned rapid prototyping or rapid manufacturing processes (RP or RM processes).
  • RP or RM processes rapid prototyping or rapid manufacturing processes
  • PMMI N-memylmethycrylimide
  • PMMA polymethyl methacrylate
  • ionomer polyamide, copolyester, copolyamides, terpolymers, acrylonitrile-butadiene-styrene copolymers (ABS) or mixtures thereof.
  • a disadvantage is the low resolution with regard to component accuracy.
  • polymer powder can be produced by adding carbon black to thermoplastic plastics, from which molded articles can be produced by a layer-by-layer process, in which areas of the respective layer are selectively melted, which enable a significantly higher resolution as a shaped body made of conventional polymer powders. It was also possible to ascertain better processability and improved mechanics of the shaped bodies.
  • the present invention therefore relates to a polymer powder for processing in a layer-by-layer process, in which areas of the respective layer are selectively melted, which is characterized in that the powder has at least one polymer, preferably polyamide, and soot particles
  • the present invention also relates to a process for producing polymer powder according to the invention, which is characterized in that at least one powdered polymer is mixed with carbon black particles to form a polymer powder.
  • the polymer powder that has at least one thermoplastic soot-containing plastic can be used in a layer-by-layer process in which areas of the respective powder layer are selectively introduced by the introduction of electromagnetic energy be melted, in which the selectivity is achieved by a focused laser beam.
  • the polymer powder that has at least one thermoplastic soot-containing plastic can be used in a layer-by-layer process, in which areas of the respective powder layer are selectively melted by the entry of electromagnetic energy, in which the selectivity by the application of susceptors, inhibitors, absorbers, or masks is achieved.
  • the present invention also relates to moldings produced by a layer-by-layer process which selectively splits up areas of the respective layer which are characterized in that they have carbon black and at least one polymer.
  • the polymer powder according to the invention has the advantage that molded bodies produced from it by a layer-by-layer process in which areas of the respective layer are selectively melted have a significantly higher resolution. Shaped bodies that also have fine structures are therefore accessible.
  • Polymer powder also has improved processability than conventional polymer powders, since the powders according to the invention have an improved flowability and show significantly less tendency to charge. This applies both to the application of very thin layers and the automation of powder handling, for example via transit tubes, shaking, or fluidization of the polymer powder. This property is particularly advantageous for automated PD feeding, as is used in some processing machines that are particularly suitable for rapid manufacturing.
  • moldings produced from the polymer powder according to the invention also have an improvement in the mechanical properties, in particular an increase in the modulus of elasticity.
  • the polymer powder according to the invention and a process for its production are described below, without the invention being restricted thereto.
  • the polymer powder according to the invention for processing in a layered manner A method in which areas of the respective layer are selectively melted is characterized in that the powder has at least one polymer, preferably polyamide, and soot particles.
  • the polymer powder according to the invention preferably has a polyamide which has at least 8 carbon atoms per carbonamide group.
  • the polymer powder according to the invention preferably has at least one polyamide which has 10 or more carbon atoms per carbonamide group.
  • the polymer powder very particularly preferably has at least one polyamide selected from polyamide 612 (PA 612), polyamide 11 (PA 11) and polyamide 12 (PA 12).
  • the powder can contain at least one polymer or copolymer from the group of polyester, polyvinyl chloride, polyacetal, polypropylene, polyethylene, polystyrene, polycarbonate, poly (N-me ylme ycrylimide) (PMMI), polymethyl methacrylate (PMMA), ionomer, polyamide, copolyester , Copolyamides, terpolymers, ac ⁇ nitrile-butadiene-styrene copolymers (ABS) or mixtures thereof.
  • polymer or copolymer from the group of polyester, polyvinyl chloride, polyacetal, polypropylene, polyethylene, polystyrene, polycarbonate, poly (N-me ylme ycrylimide) (PMMI), polymethyl methacrylate (PMMA), ionomer, polyamide, copolyester , Copolyamides, terpolymers, ac ⁇ nitrile-
  • the polymer powder according to the invention preferably has polymer with an average particle size of 10 to 250 ⁇ m, preferably 45 to 150 ⁇ m and particularly preferably 50 to 125 ⁇ m.
  • the polymers present in the powder according to the invention can in particular be prepared by grinding, precipitation and / or anionic polymerization or a combination thereof or by subsequent fractionation.
  • a polyamide 12 polymer powder which has a melting temperature of 185 to 189 ° C., preferably 186 to 188 ° C., and a melting enthalpy of 112 ⁇ is particularly suitable for use in a layer-by-layer process in which areas of the respective layer are selectively melted 17 J / g, preferably from 100 to 125 J / g and a solidification temperature of 138 to 143 ° C, preferably from 140 to 142 ° C.
  • the process for the production of the polyamides which can be used in the polymers according to the invention is generally known and can be found for the production of PA 12, for example, the documents DE 29 06 647, DE 35 10 687, DE 35 10 691 and DE 4421 454.
  • the required polyamide granules can be obtained from various manufacturers, for example Polyamide 12 granules are offered by Degussa AG under the trade name VESTAMID.
  • the polymer powder according to the invention preferably has from 0.01 to 30% by weight of soot particles, preferably from 0.05 to 20% by weight of soot particles, particularly preferably from 0.08 to 15% by weight. % Soot particles and very particularly preferably from 0.1 to 2% by weight of soot particles.
  • the polymer powder according to the invention can have a mixture of soot particles and polymer particles or else polymer particles or powder which have incorporated soot particles. With a proportion of the soot particles of less than 0.01% by weight, based on the sum of the polymers present in the powder, the desired effect of the higher component resolution and the better processability clearly decreases. With a proportion of the soot particles of more than 30% by weight, based on the sum of the polymers present in the powder, the mechanical properties, e.g. the elongation at break clearly shows molded articles produced from such powders.
  • the carbon black particles contained in the polymer powder according to the invention are produced by the furnace black process, the gas black process or the flame black process, preferably by the furnace black process.
  • the primary particle size is between 10 and 100 nm, preferably between 20 and 60 nm, the particle size distribution can be narrow or wide.
  • the soot particles can be oxidatively aftertreated to adjust surface functionalities. They can be hydrophobic (for example Printex 55 or flame black 101 from Degussa) or hydrophilic (for example colored carbon black FW20 or Printex 150 T from Degussa). They can be highly structured or redesigned; this describes a degree of aggregation of the primary particles.
  • special carbon blacks the electrical conductivity of the components made from the powder according to the invention can be adjusted.
  • pearled carbon blacks better dispersibility can be used for both wet and dry mixing processes.
  • Such carbon blacks are sold commercially by Degussa, for example under the trade name Printex (for example Printex A, Printex Alpha, Printex 60, Printex XE2, Printex G, Printex L).
  • Polymer powder according to the invention can also have auxiliary substances and / or filler and / or further organic or inorganic pigments.
  • auxiliaries can be, for example, flow aids, such as, for example, precipitated and / or pyrogenic silicas.
  • Precipitated silicas for example, are offered by Degussa AG under the product name Aerosil, with different specifications.
  • Polymer powder according to the invention preferably has less than 3% by weight, preferably from 0.001 to 2% by weight and very particularly preferably from 0.05 to 1% by weight, of such auxiliaries, based on the sum of the polymers present.
  • the fillers can be, for example, glass, metal or ceramic particles, such as glass balls, steel balls or metal grit, or foreign pigments, such as transition metal oxides.
  • the pigments can be, for example, titanium dioxide particles based on rutile or anatase.
  • the filler particles preferably have a smaller or approximately the same average particle size as the particles of the polymers.
  • the average particle size d 50 of the fillers should preferably not exceed the average particle size dso of the polymers by more than 20%, preferably by no more than 15% and very particularly preferably by no more than 5%.
  • the particle size is particularly limited by the permissible overall height or layer thickness in the rapid prototyping / rapid manufacturing system.
  • Polymer powder according to the invention preferably has less than 75% by weight, preferably from 0.001 to 70% by weight, particularly preferably from 0.05 to 50% by weight and very particularly preferably from 0.5 to 25% by weight of such fillers on the sum of the existing polymers.
  • polymer powders according to the invention can be produced in a simple manner and are preferably carried out in accordance with the method according to the invention for producing inventive powders Polymer powder, which is characterized in that at least one polymer powder is mixed with soot particles.
  • the polymer powder preferably polyamide powder
  • the carbon black particles are compounded into a polymer, preferably polyamide, and the carbon black-containing polymer obtained is processed into polymer powder.
  • carbon black particles are preferably used which have an average particle size of less than 10 ⁇ m, preferably less than 1 ⁇ m and very particularly preferably of 0.001 ⁇ m to 0.75 ⁇ m.
  • Granules are usually obtained in the compounding, which is then processed into polymer powder. The processing can e.g. by cold grinding or falling over.
  • the process variant in which the carbon black particles are compounded has the advantage over the pure mixing process that a more homogeneous distribution of the carbon black particles in the polymer powder is achieved.
  • carbon black can be mixed up externally, thus improving the powder's flow behavior.
  • the carbon black is added during the precipitation process of the polyamide.
  • a precipitation process is described for example in DE 35 10 687 and DE 29 06 647.
  • polyamide 12 for example, can be precipitated from a polyamide-ethanol solution by withdrawing ethanol and simultaneously reducing the solution temperature. If the polyamide-ethanol solution has suspended soot particles, a precipitated soot-containing polyamide powder is obtained.
  • DE 35 10 687 and DE 29 06 647 For a detailed Description of the method is made to DE 35 10 687 and DE 29 06 647.
  • this method can also be applied in a modified form to other polyamides, with the prerequisite being that polyamide and solvent are selected so that the polyamide dissolves (at an elevated temperature) in the solvent and that Polyamide precipitates at a lower temperature and / or when the solvent is removed from the solution.
  • soot particles of suitable particle size By adding soot particles of suitable particle size to this solution, the respective soot-containing polyamides are obtained.
  • a carbon black dispersion is mixed with the powder, and the powder according to the invention is obtained by subsequent drying.
  • This variant of homogeneous mixing offered the advantage over the pure mixing process that a more homogeneous distribution of the soot particles in the polymer powder is achieved.
  • pigments in particular titanium dioxide
  • addition of pigments, in particular titanium dioxide, during precipitation and subsequent addition of carbon black in the dry blend can also be advantageous.
  • pigments can be used as soot particles.
  • Commercially available carbon blacks are meant, such as those offered by Degussa AG, Cäbot Co ⁇ ., Or Continental Carbon.
  • a leveling agent such as, for example, metal soaps, preferably alkali metal or alkaline earth metal salts of the underlying alkane monocarboxylic acids or dimer acids, can be added to the precipitated or cold-ground powder.
  • the metal soap particles can be incorporated into the polymer particles, but mixtures of finely divided metal soap particles and polymer particles can also be present.
  • the leveling agent can be added before, after or simultaneously with the addition of the carbon black.
  • the metal soaps were used in amounts of 0.01 to 30% by weight, preferably 0.5 to 15% by weight, based on the sum of the polymers, preferably polyamides, present in the powder.
  • the sodium or calcium salts of the underlying alkane monocarboxylic acids or dimer acids were preferably used as metal soaps.
  • examples for commercially available products are Licomont NaV 101 or Licomont CaV 102 from Clariant
  • the polymer powder can contain inorganic foreign pigments, such as Transition metal oxides, stabilizers such as e.g. Phenols, especially sterically hindered phenols, leveling and pouring aids, e.g. pyrogenic silicas and filler particles are added.
  • stabilizers such as e.g. Phenols, especially sterically hindered phenols, leveling and pouring aids, e.g. pyrogenic silicas and filler particles are added.
  • leveling and pouring aids e.g. pyrogenic silicas and filler particles are added.
  • the present invention also relates to processes for the production of molded articles by processes which work in layers, in which areas are selectively melted by the introduction of electromagnetic energy and in which polyme powders according to the invention which have polymer, preferably polyamide, and soot particles are used.
  • the present invention relates to a process for the production of moldings by selective laser sintering of a soot-containing precipitated powder based on a polyamide 12, which has a melting temperature of 185 to 189 ° C, a melting enthalpy of 112 + 17 J / g and a solidification temperature of 138 to 143 ° C and its use is described in US 6,245,281.
  • the molded bodies according to the invention which are produced by a layer-by-layer process in which areas are selectively melted, are distinguished by the fact that they contain a polymer containing soot (that is to say a polymer with finely distributed soot particles).
  • the molded articles according to the invention preferably have at least one carbon black-containing polyamide which has at least 8 carbon atoms per carbonamide group. Molds according to the invention very particularly preferably have at least one carbon black-containing polyamide 612, polyamide 11 and / or a polyamide 12.
  • the carbon black present in the molded body according to the invention can have been produced both by the gas black process and by the furnace black process or the flame black process.
  • 15 Hydrophilic or hydrophobic properties can be adjusted by functional groups, this depends on the desired compatibility with the polymer matrix.
  • the molded body according to the invention based on the sum of the ⁇ *> molded body existing polymers, from 0.01 to 30 wt *> carbon black, preferably from 0.05 to 20 wt .-%, particularly preferably from 0.08 to 5% by weight and very particularly preferably from 0.1 20 to 2% by weight
  • the moldings may also have fillers and / or auxiliaries, such as thermal stabilizers such as sterically hindered phenol derivatives.
  • Fillers can be, for example, glass, ceramic particles and also metal particles such as iron balls or 25 corresponding hollow balls.
  • the shaped bodies according to the invention preferably have glass beads, very particularly preferably glass balls. Shaped bodies according to the invention preferably have less than 3% by weight, preferably from 0.001 to 2% by weight and very particularly preferably from 0.05 to 1% by weight of such auxiliaries, based on the sum of the polymers present.
  • Moldings according to the invention likewise preferably have less than 30% by weight, preferably from 0.001 to 70% by weight, particularly preferably from 0.05 to 50% by weight and very particularly preferably from 0.5 to 25% by weight. such fillers based on the sum of the polymers present.
  • the following examples are intended to describe the sin powder according to the invention and its use, without restricting the invention to the examples.
  • the BET surface area determined in the examples below was carried out in accordance with DIN 66131.
  • the bulk density was determined using an apparatus in accordance with DIN 53644.
  • the measured values of the laser diffraction were measured with the Malvern Mastersizer S, Ver. 2.18.
  • the beam compensation is determined according to an internal regulation and is a measure of the accuracy. The smaller it is, the more precisely a structure can be mapped using the various methods.
  • rods of different lengths are built with a laser sintering machine, which are 10 mm wide and 3 mm thick. The lengths are 5, 8, 10, 20, 50 and 100 mm. For easier handling, they are connected to each other by a narrow bridge. The components are placed in the 4 corners of the installation space.
  • the individual sets are rotated 90 ° to each other.
  • the lengths of the bars are measured with calipers, each on the sides and in the middle, the measured values of the 4 components are averaged, and then the target and actual values are plotted against each other. After determining the regression line through these points, you get the value for the beam compensation ° in mm); this is the intersection by which the best-fit line is shifted from the zero point (constant value of the straight line equation).
  • the jacket temperature will be kept 2K - 3K below the inside temperature at the same cooling rate.
  • the internal temperature is brought to 117 ° C. with the same cooling rate and then kept constant for 60 minutes.
  • distillation is continued at a cooling rate of 40 K / h, bringing the internal temperature to 111 ° C
  • the precipitation starts at this temperature, recognizable by the heat development.
  • the distillation rate is increased so that the internal temperature does not rise above 111.3 ° C.
  • the internal temperature drops, which indicates the end of the precipitation.
  • the ethanol is distilled off at 70 ° C / 400 mbar and the residue is subsequently dried at 20 mbar / 86 ° C for 3 hours.
  • a precipitated PA 12 with an average grain diameter of 55 ⁇ m is obtained.
  • the bulk density was 435 g / 1.
  • Example 1 was repeated, 8 kg (corresponding to 2%) of carbon black pigment Printex 60 (Degussa) being added before the solution. Precipitation and drying take place as described above. A precipitated PA 12 is obtained, which contains soot particles. 40 g of Aerosil 200 (0.1 part) were then mixed in at room temperature and 500 rpm for 3 minutes. The bulk density of the product was 470 g / 1.
  • Example 3 Reprecipitation of PA 12 to carbon black pigment: Example 1 is repeated, 4 kg (corresponding to 1%) carbon black pigment Printex Alpha (Degussa) being added before the solution. Precipitation and drying take place as described above. Again a precipitated PA 12 was obtained, which contains soot particles. 40 g of Aerosil 200 (0.1 part) were then mixed in at room temperature and 500 rpm for 3 minutes. The bulk density of the product was 450 g / 1.
  • Example 1 is repeated, 12 kg (corresponding to 3%) of carbon black pigment Printex XE2 (conductivity black) (Degussa) being added before the solution. Precipitation and drying take place as described above. A precipitated PA 12 was again obtained, which contained soot particles. 40 g of Aerosil 200 (0.1 part) were then mixed in at room temperature and 500 rpm for 3 minutes. The bulk density of the product was 453 g / l.
  • Derussol A 300 carbon black dispersion, thus contains 1% Printex A) (Degussa) in a dry blend process using a Flexomix mixer from Schugi mixed at 3000 rpm. It is a downspout with a diameter of 100 mm, in which a rotor with spray nozzles moves so that the dispersion is sprayed on the powder.
  • the powder obtained in this way is then mixed in a 60:40 ratio with glass spheres which have a d50 value of 60 ⁇ m.
  • Glass spheres from Potters of the Spheriglass A glass type with a coating with a diameter of 35 ⁇ m were used.
  • the same mixer is used with the same conditions as before, but the mixing time only takes 1 minute.
  • Example 10 Incorporation of Printex Alpha and metal soap in a dry blend
  • polyamide 12 powder produced according to DE 29 06 647
  • Example 1 with an average grain diameter d 50 of 56 ⁇ m (laser diffraction) and a bulk density according to DIN 53 466 of 459 g / 1, 2 g (0.1 part) of Printex Alpha is mixed in a dry blend process using a Henschel mixer FML10 / KM23 at 1500 rpm at 50 ° C in 5 minutes.
  • 40 g (2 parts) of Licomont NaV 101 and 2 g of Aerosil 200 (0.1 part) were mixed in.
  • the bulk density of the modified powder is 470 g / l.
  • Example 11 Incorporation of Printex Alpha and Metal Soap in a Dry Blend To 1900 g (97.7 parts) of polyamide 12 powder, produced according to DE 29 06 647, Example 1 with an average grain diameter dso of 56 ⁇ m (laser diffraction) and a bulk density according to DIN 53 466 of 459 g / 1 becomes 2 g (0.1 part) Printex Alpha and 40 g (2 parts) Licomont NaV 101 in a dry blend process using a Henschel mixer FML10 / KM23 at 1500 rpm at 40 ° C mixed in 3 minutes. Then 2 g of Aerosil 200 (0.1 part) were added Room temperature and 500 rpm mixed in in 1 minute. The bulk density of the modified powder is 471 g / 1.
  • Example 12 Incorporation of Printex Alpha and metal soap in a Drv Blend To 1900 g (97.7 parts) polyamide 12 powder, produced according to DE 29 06 647, Example 1 with an average grain diameter d 50 of 56 ⁇ m (laser diffraction) and a bulk density According to DIN 53 466 of 459 g / 1, 2 g (0.1 part) Printex Alpha and 40 g (2 parts) Licomont NaV 101 are dry blended using a Henschel mixer FML10 / KM23 at 1500 rpm at 70 ° C mixed in 3 minutes. 2 g of Aerosil 200 (0.1 part) were then mixed in at room temperature and 500 rpm in 1 minute. The bulk density of the modified powder was 474 g / l.
  • the powders from Examples 1, 5 and 9 to 12 were built into multi-purpose rods according to ISO 3167 on a laser sintering machine. Mechanical values were determined on the latter components by means of a tensile test in accordance with EN ISO 527 (Table 1). The production took place on a laser sintering machine EOSINT P380 from EOS GmbH.
  • the molded articles according to the invention made from inventive polymer powder according to Examples 2 to 6 have a significantly higher modulus of elasticity than molded articles made from conventional polymer powder.
  • the beam compensation - a measure of the resolution - is significantly lower, which means that the structures can be resolved more finely.
  • the advantage of the powders according to the invention is that the processability is significantly better than that of conventional polymer powder. Movements in the transit tube, through a vibrator or through fluidization can also be easily implemented with new powder as well as with reused powder.

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Abstract

La présente invention concerne une poudre polymère pourvue de particules de suie, un procédé de production de ladite poudre, son utilisation dans des procédés de façonnage ainsi que des corps moulés réalisés à partir de cette poudre polymère. Les corps moulés réalisés à l'aide de ladite poudre présentent une résolution supérieure à celle de produits classiques en matière de précision des composants. Un autre avantage réside dans la meilleure moulabilité, puisque les poudres selon l'invention présentent une meilleure faculté d'écoulement et une tendance à la charge bien plus faible. Cette propriété est particulièrement avantageuse dans le cas d'une alimentation en poudre automatisée telle que sur bon nombre de machines de transformation particulièrement adaptées à la fabrication rapide (rapid manufacturing). De plus, des corps moulés réalisés à partir de la poudre polymère selon l'invention présentent également des propriétés mécaniques considérablement améliorées par rapport à des corps moulés à base de poudres polymères classiques, en particulier en matière de module d'élasticité.
PCT/EP2004/053420 2004-02-26 2004-12-13 Poudre polymere a particules de suie, procede de production et corps moules realises a partir de cette poudre polymere WO2005085326A1 (fr)

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DE102004009234.6 2004-02-26
DE102004009234A DE102004009234A1 (de) 2004-02-26 2004-02-26 Polymerpulver mit Rußpartikeln, Verfahren zu dessen Herstellung und Formkörper, hergestellt aus diesem Polymerpulver

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018141631A1 (fr) * 2017-02-01 2018-08-09 Basf Se Procédé pour la fabrication d'une poudre de polyamide par précipitation
EP3385307A1 (fr) 2008-04-29 2018-10-10 Arkema France Procédé pour augmenter l écart entre la température de fusion et la température de cristallisation d'une poudre de polyamide
US10406745B2 (en) 2010-04-09 2019-09-10 Evonik Degussa Gmbh Polyamide-based polymer powder, use thereof in a molding method, and molded articles made from said polymer powder
WO2020099236A1 (fr) * 2018-11-12 2020-05-22 Eos Gmbh Electro Optical Systems Matériau constitutif à base de polymère destiné au frittage sélectif
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EP3385307A1 (fr) 2008-04-29 2018-10-10 Arkema France Procédé pour augmenter l écart entre la température de fusion et la température de cristallisation d'une poudre de polyamide
US10836117B2 (en) 2008-04-29 2020-11-17 Arkema France Method for increasing the difference between the melting temperature and the crystallization temperature of a polyamide powder
US11718045B2 (en) 2008-04-29 2023-08-08 Arkema France Method for increasing the difference between the melting temperature and the crystallization temperature of a polyamide powder
US10406745B2 (en) 2010-04-09 2019-09-10 Evonik Degussa Gmbh Polyamide-based polymer powder, use thereof in a molding method, and molded articles made from said polymer powder
US10968314B2 (en) 2015-12-14 2021-04-06 Evonik Operations Gmbh Polymer powder for powder bed fusion methods
CN110382188A (zh) * 2017-02-01 2019-10-25 巴斯夫欧洲公司 通过沉淀生产聚酰胺粉末的方法
WO2018141631A1 (fr) * 2017-02-01 2018-08-09 Basf Se Procédé pour la fabrication d'une poudre de polyamide par précipitation
US11697716B2 (en) 2017-02-01 2023-07-11 BASF SE (Ellwanger & Baier Patentanwälte) Process for producing a polyamide powder by precipitation
US20210403714A1 (en) * 2018-11-09 2021-12-30 Hunan Farsoon High-Tech Co., Ltd. High molecular polymer powder material and preparation method thereof
US12139611B2 (en) * 2018-11-09 2024-11-12 Farsoon Technologies Co., Ltd. High molecular polymer powder material and preparation method thereof
WO2020099236A1 (fr) * 2018-11-12 2020-05-22 Eos Gmbh Electro Optical Systems Matériau constitutif à base de polymère destiné au frittage sélectif
EP3853025A1 (fr) * 2018-11-12 2021-07-28 EOS GmbH Electro Optical Systems Poudre plastique à déformation optimisée
EP3853024A1 (fr) * 2018-11-12 2021-07-28 EOS GmbH Electro Optical Systems Matériau constitutif à base de polymère destiné au frittage sélectif
US12098297B2 (en) 2018-11-12 2024-09-24 Eos Gmbh Electro Optical Systems Polymer-based build material for selective sintering
WO2020099237A1 (fr) * 2018-11-12 2020-05-22 Eos Gmbh Electro Optical Systems Poudre plastique à déformation optimisée
CN114269854A (zh) * 2019-08-16 2022-04-01 Eos有限公司电镀光纤系统 聚合物基复合材料的选择性烧结

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